WGU D425 INTRO TO CHEMISTRY
OBJECTIVE ASSESSMENT ACTUAL EXAM
2025/2026 ACCURATE QUESTIONS WITH
CORRECT DETAILED ANSWERS || 100%
GUARANTEED PASS <NEWEST VERSION>
1) Mole Ratio - ANSWER Conversion factor between compounds in a chemical
reaction
2) Stoichiometry - ANSWER Study of numerical relationships between reactants and
products in balanced chemical reactions
3) Balanced Reaction - ANSWER Reaction with equal numbers of elements on both
sides of the equation
4) Stoichiometric Coefficient - ANSWER Number in front of atoms, ions, or
molecules to balance a chemical reaction on both sides
5) Excess Reactant - ANSWER the extra in a chemical reaction
6) Limiting Reactant - ANSWER Reactant consumed first in a chemical reaction
7) Percent Yield - ANSWER Ratio of actual yield to theoretical yield
8) Theoretical Yield - ANSWER Maximum product amount that can be formed in a
chemical reaction
,9) Step 1 for determining Limiting Reactant - ANSWER Convert all starting
quantities into moles (can not do it from mass, concentrations, or gas pressure)
10) Step 2 for determining Limiting Reactant - ANSWER Use coefficients from a
balanced equation to convert moles of BOTH reactants given to moles of a DESIRED
product
11) Step 3 for determining Limiting Reactant - ANSWER whichever reactant produces
LESS products is the LIMITING REACTANT and should be used on step 4
12) Step 4 for determining Theoretical Yield after limiting reactant - ANSWER
Convert moles of product from the limiting reactant to final units (usually grams)
13) Diatomic Elements - ANSWER Elements that exist as molecules in pairs (H2, N2,
O2, F2, Cl2, Br2, I2)
14) Percent Yield Equation - ANSWER (Actual Yield/Theoretical Yield) x 100%
15) Calculate the density of 10.4mL sample of a substance with a mass of 35.12g. Enter
the answer in the correct number of significant figures and include the unit g/mL -
ANSWER
16) convert 12.5g in to kilograms. enter answer in kg - ANSWER 0.0125
17) How many valance electrons do halogens have? - ANSWER 7 valance electrons
18) reaction rate - ANSWER the rate at which reactants change into products over
time
19) How does increasing temperature affect the rate of reaction? - ANSWER
increasing temperature caused the kinetic energy to increase. Thus, Molecules are
, moving faster and colliding more frequently. This causes the rate of reaction to
increase.
20) Solid - ANSWER Definite shape and volume
21) extensive properties - ANSWER depend on the amount of matter that is present
22) 1 meter = ____ centimeters - ANSWER 100 centimeters
23) 1 kg = ? lbs - ANSWER 2.2 lbs
24) grams to moles - ANSWER grams/molar mass
25) mg to g - ANSWER 1000 mg = 1 g
26) Isotopes - ANSWER Atoms of the same element that have different numbers of
neutrons
27) combination reaction (synthesis reaction) - ANSWER A type of chemical reaction
where two or more reactants combine to form one product( A+B=AB)
28) Which geometric shape has an angle of 109.5 degrees between electron groups? -
ANSWER Tetrahedral
29) functional groups - ANSWER A specific configuration of atoms commonly
attached to the carbon skeletons of organic molecules and involved in chemical
reactions.
30) What geometric structure has an angle of 180 degreed? - ANSWER Linear
31) ___________ describes solubility of a nonpolar covalent compound in water -
ANSWER Immiscible
, 32) A hot saturated solution is slowly cooled to room temperature so that all the solute
remains in the solution, exceeding the solute's maximum solubility limit at room
temperature. Which term best describes the solution formed? - ANSWER
Saturated
33) Beaker A contains 10 mg of calcium chloride dissolved in 100 mL of ethanol, and
beaker B contains 8 mg of calcium chloride dissolved in 100 mL of ethanol. When
compared to beaker B, which statement best describes the solution in beaker A? -
ANSWER its more concentrated
34) molar concentration (molarity) - ANSWER the number of moles of solute
dissolved in one litter of solution
35) % by mass equation - ANSWER mass of solute/mass of solution x 100
36) As the temperature of the gas decreases and the pressure increases, which phase
change occurs? - ANSWER Liquification
37) diatomic molecule - ANSWER A molecule consisting of two atoms
38) Monoatomic - ANSWER consisting of one atom
39) potential energy - ANSWER stored energy
40) kinetic energy - ANSWER energy associated with motion
41) law of conservation of mass - ANSWER Matter is not created nor destroyed in
any chemical or physical change
42) A substance has an indefinite shape and volume. The individual particles of this
substance are not in contact and are in random positions. - ANSWER gas
OBJECTIVE ASSESSMENT ACTUAL EXAM
2025/2026 ACCURATE QUESTIONS WITH
CORRECT DETAILED ANSWERS || 100%
GUARANTEED PASS <NEWEST VERSION>
1) Mole Ratio - ANSWER Conversion factor between compounds in a chemical
reaction
2) Stoichiometry - ANSWER Study of numerical relationships between reactants and
products in balanced chemical reactions
3) Balanced Reaction - ANSWER Reaction with equal numbers of elements on both
sides of the equation
4) Stoichiometric Coefficient - ANSWER Number in front of atoms, ions, or
molecules to balance a chemical reaction on both sides
5) Excess Reactant - ANSWER the extra in a chemical reaction
6) Limiting Reactant - ANSWER Reactant consumed first in a chemical reaction
7) Percent Yield - ANSWER Ratio of actual yield to theoretical yield
8) Theoretical Yield - ANSWER Maximum product amount that can be formed in a
chemical reaction
,9) Step 1 for determining Limiting Reactant - ANSWER Convert all starting
quantities into moles (can not do it from mass, concentrations, or gas pressure)
10) Step 2 for determining Limiting Reactant - ANSWER Use coefficients from a
balanced equation to convert moles of BOTH reactants given to moles of a DESIRED
product
11) Step 3 for determining Limiting Reactant - ANSWER whichever reactant produces
LESS products is the LIMITING REACTANT and should be used on step 4
12) Step 4 for determining Theoretical Yield after limiting reactant - ANSWER
Convert moles of product from the limiting reactant to final units (usually grams)
13) Diatomic Elements - ANSWER Elements that exist as molecules in pairs (H2, N2,
O2, F2, Cl2, Br2, I2)
14) Percent Yield Equation - ANSWER (Actual Yield/Theoretical Yield) x 100%
15) Calculate the density of 10.4mL sample of a substance with a mass of 35.12g. Enter
the answer in the correct number of significant figures and include the unit g/mL -
ANSWER
16) convert 12.5g in to kilograms. enter answer in kg - ANSWER 0.0125
17) How many valance electrons do halogens have? - ANSWER 7 valance electrons
18) reaction rate - ANSWER the rate at which reactants change into products over
time
19) How does increasing temperature affect the rate of reaction? - ANSWER
increasing temperature caused the kinetic energy to increase. Thus, Molecules are
, moving faster and colliding more frequently. This causes the rate of reaction to
increase.
20) Solid - ANSWER Definite shape and volume
21) extensive properties - ANSWER depend on the amount of matter that is present
22) 1 meter = ____ centimeters - ANSWER 100 centimeters
23) 1 kg = ? lbs - ANSWER 2.2 lbs
24) grams to moles - ANSWER grams/molar mass
25) mg to g - ANSWER 1000 mg = 1 g
26) Isotopes - ANSWER Atoms of the same element that have different numbers of
neutrons
27) combination reaction (synthesis reaction) - ANSWER A type of chemical reaction
where two or more reactants combine to form one product( A+B=AB)
28) Which geometric shape has an angle of 109.5 degrees between electron groups? -
ANSWER Tetrahedral
29) functional groups - ANSWER A specific configuration of atoms commonly
attached to the carbon skeletons of organic molecules and involved in chemical
reactions.
30) What geometric structure has an angle of 180 degreed? - ANSWER Linear
31) ___________ describes solubility of a nonpolar covalent compound in water -
ANSWER Immiscible
, 32) A hot saturated solution is slowly cooled to room temperature so that all the solute
remains in the solution, exceeding the solute's maximum solubility limit at room
temperature. Which term best describes the solution formed? - ANSWER
Saturated
33) Beaker A contains 10 mg of calcium chloride dissolved in 100 mL of ethanol, and
beaker B contains 8 mg of calcium chloride dissolved in 100 mL of ethanol. When
compared to beaker B, which statement best describes the solution in beaker A? -
ANSWER its more concentrated
34) molar concentration (molarity) - ANSWER the number of moles of solute
dissolved in one litter of solution
35) % by mass equation - ANSWER mass of solute/mass of solution x 100
36) As the temperature of the gas decreases and the pressure increases, which phase
change occurs? - ANSWER Liquification
37) diatomic molecule - ANSWER A molecule consisting of two atoms
38) Monoatomic - ANSWER consisting of one atom
39) potential energy - ANSWER stored energy
40) kinetic energy - ANSWER energy associated with motion
41) law of conservation of mass - ANSWER Matter is not created nor destroyed in
any chemical or physical change
42) A substance has an indefinite shape and volume. The individual particles of this
substance are not in contact and are in random positions. - ANSWER gas
